Steam box of a paper machine

Abstract

A steam box in a paper machine, the steam box including a main steam zone and at least one side steam zone through which steam is blown to a paper web. The side steam zone is placed in a side section of the steam box and arranged to form a curtain in order to prevent air from entering between the steam box and the paper web from outside the steam box and/or to prevent steam from exiting between the steam box and the paper web. Steam is supplied to the side steam zone from a steam chamber through a side steam zone valve arranged inside the steam box.

What is claimed is:  
     
       1. A steam box of a paper machine for applying steam to a paper web traveling therein, the steam box comprising a steam chamber, a main steam zone, at least one side steam zone and at least one adjustable side steam zone valve, wherein steam is supplied to the main steam zone from the steam chamber, steam is supplied to the side steam zone through the side steam zone valve from the steam chamber and the side steam zone valve is arranged inside the steam box. 
     
     
       2. A steam box as claimed in  claim 1 , wherein the steam box comprises, adjustable main steam zone valves for supplying steam to the main steam zone from the steam chamber. 
     
     
       3. A steam box as claimed in  claim 2 , wherein the steam box comprises remotely controlled profiling actuators for adjusting the main steam zone valves supplying steam to the main steam zone and at least one remotely controlled side steam zone actuator for adjusting the side steam zone valve. 
     
     
       4. A steam box as claimed in  claim 3 , wherein the profiling actuators and the side steam zone actuator are arranged in the same space inside the steam box. 
     
     
       5. A steam box as claimed in  claim 3 , wherein the profiling actuators and the side steam zone actuator are identical in structure. 
     
     
       6. A steam box as claimed in  claim 3 , wherein the actuators are electromechanical actuators. 
     
     
       7. A steam box as claimed in  claim 1 , wherein the side steam zone valve is arranged in the steam chamber. 
     
     
       8. A steam box as claimed in  claim 1 , wherein the side steam zone is divided into at least two sections in a cross direction with respect to the direction of travel of a paper web. 
     
     
       9. A steam box as claimed in  claim 1 , wherein the side steam zone is arranged in a side section of the steam box prior to the main steam zone in the direction of travel of the paper web. 
     
     
       10. A steam box as claimed in  claim 9 , wherein the side steam zone is arranged to prevent air from entering between the steam box and the paper web. 
     
     
       11. A steam box as claimed in  claim 1 , wherein the side steam zone is arranged in a side section of the steam box after the main steam zone in the direction of travel of the paper web. 
     
     
       12. A steam box as claimed in  claim 11 , wherein the side steam zone is arranged to prevent steam from exiting between the steam box and the paper web. 
     
     
       13. A steam box as claimed in  claim 1 , wherein the steam box comprises two side steam zones, wherein the first side steam zone is arranged in a side section of the steam box prior to the main steam zone in the direction of travel of the paper web and the second side steam zone is arranged after the main steam zone. 
     
     
       14. A steam box as claimed in  claim 1 , wherein the steam box is arranged in the press section of the paper machine. 
     
     
       15. A steam box as claimed in  claim 1 , wherein the steam box is arranged in a wire section of the paper machine. 
     
     
       16. A steam box as claimed in  claim 3 , wherein the actuators are pneumatic actuators. 
     
     
       17. A steam box as claimed in  claim 1 , wherein the steam box is arranged in a drying section of the paper machine. 
     
     
       18. A steam box as claimed in  claim 1 , wherein the steam box is arranged in a calender section of the paper machine.